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AFCI and GFCI do different things. Neither is necessarily better. in your garage GFCI is required by code. It's supposed to keep you from electrocuting yourself. AFCI is supposed to keep your house from burning itself down.

Comment

Yes,
GFCI belong in the kitchen, bathroom, and the garage according to code. The technology for AFCI is still developing, as they are used primarily in the bedrooms. Of course, if you place your garage refrigerator on a GFCI circuit, then you might end up with spoiled food...

Comment

As the others have said you need to use GFCI's in the garage with a few exceptions. For your refrigerator or freezer circuit you don't want it to trip so if you need to run a ckt for this type of application install a receptical that only has one outlet.(not a duplex) This would be a dedicated ckt and you can't plug something else in like a drill where you would not be protected.

The other exception I know of is if you mount the receptical up on the ceiling joists, for a garage door opener or the like. This would be considered to be not readily accessible.